Note 14 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Tax Credit Carryforward [Line Items]
Open Tax Year	2021 2022 2023 2024 2025
Deferred tax assets, valuation allowance increased	$ 18,500,000	$ 11,900,000
Gross unrecognized tax benefits	1,200,000	$ 500,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0
Domestic Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	139,300,000
Operating Loss Carryforwards, With No Expiration	89,600,000
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount	6,000,000
Domestic Tax Authority [Member] | Expiring Between 2026 And 2037 [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	49,700,000
Domestic Tax Authority [Member] | Expiring Between 2033 And 2044 [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	34,200,000
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount	$ 100,000